1
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

For a given reaction, ,$$\mathrm{X}(\mathrm{g})+\mathrm{Y}(\mathrm{g} \rightarrow \mathrm{Z}(\mathrm{g})$$, the order of reaction with respect to $$\mathrm{X}$$ and $$\mathrm{Y}$$ are $$\mathrm{m}$$ and $$\mathrm{n}$$ respectively. If the concentration of $$\mathrm{X}$$ is tripled and that of $$\mathrm{Y}$$ is decreased to one third, what is the ratio between the new rate to the original rate of the reaction?

A
$$3^{(m-n)}$$
B
$$3^{(n-m)}$$
C
$$(m+n)$$
D
$$\frac{1}{3^{(m+n)}}$$
2
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

For a reaction $$5 X+Y \rightarrow 3 Z$$, the rate of formation of $$Z$$ is $$2.4 \times 10^{-5} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$$ Calculate the average rate of disappearance of $$\mathrm{X}$$.

A
$$4.8 \times 10^{-7} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$$
B
$$13.33 \times 10^{-6} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$$
C
$$4.0 \times 10^{-5} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$$
D
$$12.0 \times 10^{-5} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$$
3
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

In the presence of a catalyst at a given temperature of $$27^{\circ} \mathrm{C}$$, the Activation energy of a specific reaction is reduced by $$100 \mathrm{~J} / \mathrm{mol}$$. What is the ratio between the rate constants for the catalysed $$(\mathrm{k}_2)$$ and uncatalysed $$(\mathrm{k}_1)$$ reactions?

A
$$1.04 \times 10^{-2}$$
B
$$2.32 \times 10^{-2}$$
C
1.97
D
1.04
4
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

The following data was recorded for the decomposition of XY compound at 750K

[XY] mol / L Rate of decomposition of XY mol / L s
0.4 $$5.5\times10^{-7}$$
0.8 $$22.0\times10^{-7}$$
1.2 $$49.5\times10^{-7}$$

What is the order of reaction with respect to decomposition of XY?

A
0
B
2
C
1
D
1.5
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